How to substitute one object with another in animation clip

Hi everyone!

Does anybody know is there a way in Unity5 to substitute one object with another in animation clip? What is i mean: for ex. we have an animation clip, which is used in animator controller of player character. This animation clip just changes a character head position. But, on some step of development i decided that this animation clip is more suitable for character neck rather than head. Is there any simple way to apply changing of head position in this clip to a neck?

If it does matter for somebody, i develop a 2d game with side camera view (platformer-like). Character has a several controlled parts like arms and head.

Sorry for my english! Thanks everyone!